Optics: measuring and testing – With plural diverse test or art
Patent
1996-12-09
1998-01-06
Font, Frank G.
Optics: measuring and testing
With plural diverse test or art
356243, 356357, 369 55, 324 731, 360103, G01N 2100
Patent
active
057060800
ABSTRACT:
A tester which can measure both the air bearing thickness and the dynamic electrical characteristics of a head gimbal assembly (HGA) of a hard disk drive. The tester has a disk that is rotated by a spindle motor. The disk has a transparent portion that is used to measure the air bearing thickness and a magnetic portion that used to measure the electrical characteristics. The HGA is moved adjacent to the transparent and magnetic portions by a loader mechanism. The HGA is separated from the rotating disk by an air bearing. The tester has an optical system which measures the thickness of the air bearing when the HGA is adjacent to the transparent portion of the disk. The tester also has an electrical tester which measures the electrical characteristics when the HGA is adjacent to the magnetic portion. The loader mechanism moves the HGA between the transparent and magnetic portions so that the air bearing thickness and the electrical characteristics of an HGA can be measured in the same tester.
REFERENCES:
patent: 3683273 (1972-08-01), Behr et al.
patent: 4479090 (1984-10-01), Frater et al.
patent: 4777544 (1988-10-01), Brown et al.
Machcha Ashok
Pekin David F.
Font Frank G.
Phase Metrics
Vierra-Eisenberg Jason D.
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